[Water--a key molecule in the effect of therapeutic physical factors].

The article presents current conceptions of the structure, physicochemical properties and biological functions of water in terms of their physiotherapeutic value. Water may be essential not only in mechanisms of action of therapeutic physical factors but also in their selective absorption by tissues. Information is given on changes in water properties in response to its exposure to electric currents, ultrasound, magnetic and electromagnetic fields, laser radiation and other physiotherapeutic factors.